RBB4-G Megaohm Decade Box
100 kOhms to 1000 Megaohms
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The RBB4-G is a 4 dial high resistance decade box especially constructed for the simulation of high resistances and the calibration of insulation test sets. The maximum selectable value is 1000 Megaohms in steps of 100 kΩ. The top 2 decades will withstand up to 1000 volts dc.
Each unit is supplied complete with a calibration certificate with test
figures for each decade position.
Decade |
Nominal Accuracy |
Accuracy of Certified Value @ 20 °C |
Maximum Volts d.c. |
Max Power |
Temperature Coefficient |
10 x 100 MΩ |
± 5% |
± 0.5% |
1,000 |
0.4 W |
100 ppm / °C |
10 x 10 MΩ |
± 5% |
± 0.25% |
1,000 |
0.4 W |
100 ppm / °C |
10 x 1 MΩ |
± 2% |
± 0.1% |
750 |
0.5 W |
100 ppm / °C |
10 x 0.1 MΩ |
± 2% |
± 0.1% |
250 |
0.5 W |
100 ppm / °C |
CONSTRUCTION
The switches and coils are mounted on a bakelite sub-panel and protected
by a grey painted metal cover panel.
Switches: CROPICO type SP1 incorporating 8 mm diameter stud
contacts and a self-cleaning multi-leaf phosphor bronze brush.
Contact resistance is less than 140 microhms per decade.
Terminals: insulated will accept spade tags or 4mm banana plugs.
Calibration: Temperature 20 deg. Centigrade.
Test Voltage: 2kV dc between terminals and top panel.